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Tree species effects on topsoil carbon stock and concentration are mediated by tree species type, mycorrhizal association, and N-fixing ability at the global scale

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Autor(es):
Peng, Yan [1] ; Schmidt, Inger Kappel [1] ; Zheng, Haifeng [1] ; Hedenec, Petr [1] ; Bachega, Luciana Ruggiero [2] ; Yue, Kai [3, 4, 5] ; Wu, Fuzhong [3] ; Vesterdal, Lars [1]
Número total de Autores: 8
Afiliação do(s) autor(es):
[1] Univ Copenhagen, Dept Geosci & Nat Resource Management, Rolighedsvej 23, DK-1958 Frederiksberg C - Denmark
[2] Fed Univ Sao Carlos UFSCar, Dept Environm Sci, BR-13565905 Sao Carlos, SP - Brazil
[3] Fujian Normal Univ, Sch Geog Sci, State Key Lab Subtrop Mt Ecol, Fuzhou 350007 - Peoples R China
[4] Aarhus Univ, Ctr Biodivers Dynam Changing World BIOCHANGE, Dept Biol, NyMunkegade 114, DK-8000 Aarhus C - Denmark
[5] Aarhus Univ, Sect Ecoinforrnat & Biodivers, Dept Biol, NyMunkegade 114, DK-8000 Aarhus C - Denmark
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: FOREST ECOLOGY AND MANAGEMENT; v. 478, DEC 15 2020.
Citações Web of Science: 0
Resumo

Selection of appropriate tree species is an important forest management decision that may affect sequestration of carbon (C) in soil. However, information about tree species effects on soil C stocks at the global scale remains unclear. Here, we quantitatively synthesized 850 observations from field studies that were conducted in a common garden or monoculture plantations to assess how tree species type (broadleaf vs. conifer), mycorrhizal association (arbuscular mycorrhizal (AM) vs. ectomycorrhizal (ECM)), and N-fixing ability (N-fixing vs. non-N-fixing), directly and indirectly, affect topsoil (with a median depth of 10 cm) C concentration and stock, and how such effects were influenced by environmental factors such as geographical location and climate. We found that (1) tree species type, mycorrhizal association, and N-fixing ability were all important factors affecting soil C, with lower forest floor C stocks under broadleaved (44%), AM (39%), or N-fixing (28%) trees respectively, but higher mineral soil C concentration (11%, 22%, and 156%) and stock (9%, 10%, and 6%) under broadleaved, AM, and N-fixing trees respectively; (2) tree species type, mycorrhizal association, and N-fixing ability affected forest floor C stock and mineral soil C concentration and stock directly or indirectly through impacting soil properties such as microbial biomass C and nitrogen; (3) tree species effects on mineral soil C concentration and stock were mediated by latitude, MAT, MAP, and forest stand age. These results reveal how tree species and their specific traits influence forest floor C stock and mineral soil C concentration and stock at a global scale. Insights into the underlying mechanisms of tree species effects found in our study would be useful to inform tree species selection in forest management or afforestation aiming to sequester more atmospheric C in soil for mitigation of climate change. (AU)

Processo FAPESP: 17/26019-0 - Comunidades funcionais microbianas do solo em florestas tropicais em processo de restauração
Beneficiário:Luciana Ruggiero Bachega
Linha de fomento: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
Processo FAPESP: 15/14785-5 - A camada serapilheira-solo em áreas de reflorestamento de matas ciliares
Beneficiário:Luciana Ruggiero Bachega
Linha de fomento: Bolsas no Brasil - Doutorado